Notices

tire (front right) inside rubber starts to peel of ?

 
Old 04-21-2019, 01:31 PM
  #1  
pold9000
Addict
Rennlist Member
Thread Starter
 
Join Date: Feb 2010
Posts: 115
Default tire (front right) inside rubber starts to peel of ?

hello
all of my front tires starts with the same problem after about 500 km track
is there too much camber?
its a porsche 991.1 cup with 5.2 degrees
front co driver side


inner side front right wheel camber too high ?

same pic with the rest of the tire

Last edited by pold9000; 04-21-2019 at 01:33 PM. Reason: change title
pold9000 is offline  
Old 04-21-2019, 04:51 PM
  #2  
cup997laurent
Addict
Rennlist Member
 
cup997laurent's Avatar
 
Join Date: Mar 2013
Location: south of france
Posts: 267
Default

I’m not a specialist of the 991 cup but for the other porsche cups 5.2 in front seems a lot . On an other hand 500 Km on track use is a lot . If the outside is still good you can try to have the tyre working more flat with less camber .
cup997laurent is offline  
Old 04-21-2019, 08:33 PM
  #3  
pold9000
Addict
Rennlist Member
Thread Starter
 
Join Date: Feb 2010
Posts: 115
Default

the outside is still good - my opinion like new, also the middle part is not warn, the inner marker shows also some rubber

toe is 4mm out - could this a problem?

if i do less camber - what will change?
pold9000 is offline  
Old 04-22-2019, 08:12 AM
  #4  
coryf
Addict
Rennlist Member
 
coryf's Avatar
 
Join Date: Aug 2001
Location: Charleston SC
Posts: 1,170
Default

In my opinion:

Too much negative camber. (By at least 1 degree)
Too much front toe out (You are more than double what we typically run)
Too much run time. (Our guys only run the tire 5-6 runs before changing)

If you have room to slide the upper mounts out, it will reduce the camber and bring the toe in. Make sure to do a proper setup though.
coryf is offline  
Old 04-22-2019, 10:42 AM
  #5  
Steve113
Addict
Rennlist Member
 
Steve113's Avatar
 
Join Date: May 2009
Location: Rockland County NY
Posts: 1,477
Default

Toe out in conjunction with all that neg camber drags that inside edge
Steve113 is offline  
Old 04-22-2019, 12:00 PM
  #6  
pold9000
Addict
Rennlist Member
Thread Starter
 
Join Date: Feb 2010
Posts: 115
Default changing inside to outside

thanks guys for the information

but what will happen if i change the tire on the wheel - inside to outside?

have this someone done or is this a no go?

wolfgang
pold9000 is offline  
Old 04-23-2019, 09:32 AM
  #7  
MarcD147
Addict
Rennlist Member
 
MarcD147's Avatar
 
Join Date: Jan 2015
Location: Philadelphia, PA
Posts: 1,053
Default

Originally Posted by pold9000 View Post
thanks guys for the information

but what will happen if i change the tire on the wheel - inside to outside?

have this someone done or is this a no go?

wolfgang
your setup is not right and it is destroying your tires (and likely laptime) follow CoryF's advice
MarcD147 is offline  
Old 04-23-2019, 03:58 PM
  #8  
Steve113
Addict
Rennlist Member
 
Steve113's Avatar
 
Join Date: May 2009
Location: Rockland County NY
Posts: 1,477
Default

Tires shot what they said go get it set up correctly
Steve113 is offline  
Old 04-23-2019, 07:48 PM
  #9  
spiller
User
 
spiller's Avatar
 
Join Date: Dec 2012
Location: Adelaide, Australia
Posts: 1,375
Default

I find the comments on too much camber interesting. My car runs -5.2 up front and the shop who set it up have been running cars in Carrera Cup for over 15 years. Also the old set up sheets from another team that ran my car professionally also ran -5.2. Yes a small sample size but would like to know more about this and why this much camber is detrimental? Does it increase understeer, braking performance or is it a tyre life issue?
spiller is offline  
Old 04-24-2019, 01:59 PM
  #10  
Steve113
Addict
Rennlist Member
 
Steve113's Avatar
 
Join Date: May 2009
Location: Rockland County NY
Posts: 1,477
Default

"Does it increase understeer, braking performance or is it a tyre life issue?"

Could do all of the above depending on other parameters. I run low 4's front and rear
Steve113 is offline  
Old 04-29-2019, 10:33 AM
  #11  
amso3
Addict
Rennlist Member
 
amso3's Avatar
 
Join Date: Apr 2004
Location: North Port, FL
Posts: 1,758
Default

Agree with Cory, too much camber and too much toe out.
amso3 is offline  
Old 04-29-2019, 06:55 PM
  #12  
pold9000
Addict
Rennlist Member
Thread Starter
 
Join Date: Feb 2010
Posts: 115
Default

Originally Posted by amso3 View Post
Agree with Cory, too much camber and too much toe out.
jerry toe 2mm out and camber to 4.8 or 4.5?
pold9000 is offline  
Old 04-29-2019, 10:58 PM
  #13  
spiller
User
 
spiller's Avatar
 
Join Date: Dec 2012
Location: Adelaide, Australia
Posts: 1,375
Default

Originally Posted by Steve113 View Post
"Does it increase understeer, braking performance or is it a tyre life issue?"

Could do all of the above depending on other parameters. I run low 4's front and rear
\
Cool. Now that I think about it, I've had a bit too much mid corner understeer since going to the set up I mentioned. I always thought it was down to the tire but food for thought. I will get my camber brought back to 4.2 and give it a try.
spiller is offline  
Old 04-30-2019, 09:27 AM
  #14  
amso3
Addict
Rennlist Member
 
amso3's Avatar
 
Join Date: Apr 2004
Location: North Port, FL
Posts: 1,758
Default

Pold9000, I'd try 0.75 mm toe out each side and 4.5 camber but your rear should be around 4 degrees, you didn't mention what that is set at. You should be measuring tire temps after a hot session to help dial in camber
amso3 is offline  
Old 05-05-2019, 07:09 PM
  #15  
pold9000
Addict
Rennlist Member
Thread Starter
 
Join Date: Feb 2010
Posts: 115
Default

Originally Posted by amso3 View Post
Pold9000, I'd try 0.75 mm toe out each side and 4.5 camber but your rear should be around 4 degrees, you didn't mention what that is set at. You should be measuring tire temps after a hot session to help dial in camber
jerry rear toe is 2mm in, camber rear is 4,9░
pold9000 is offline  

Thread Tools
Search this Thread

Contact Us - About Us - Advertising - Cookie Policy - Privacy Statement - Terms of Service

© 2019 MH Sub I, LLC dba Internet Brands

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.
 
  • Ask a Question
    Get answers from community experts
Question Title:
Description:
Your question will be posted in: